A stripping strength testing device for a copper clad laminate

Abstract

The present invention discloses a peeling strength testing device for a copper clad laminate, which relates to the technical field of peeling strength testing, and includes: a base, on the left end of the base, a vertical guide rail is fixedly installed; a clamping jaw, the clamping jaw is slidably arranged in the vertical guide rail; a lifting mechanism, which includes a lifting screw rod rotatably arranged in the vertical guide rail and a driving motor connected to the upper end of the lifting screw rod, the lifting screw rod is threadedly connected with the clamping jaw; a horizontal guide rail, the horizontal guide rail is slidably arranged on the base and is located directly below the clamping jaw; a pressing strip, arranged on both sides of the horizontal guide rail; a polishing roller, arranged at the right end of the base; two cutting wheels, arranged on the base and corresponding to the upper part of the middle of the horizontal guide rail; the present invention has the beneficial effects of high automation degree, strong adaptability and compact structure.

Description

Technical Field

[0001] The present invention relates to the technical field of peel strength testing, and particularly to a peel strength testing device for copper clad laminates. Background Art

[0002] Copper clad laminate (CCL) is an important component of printed circuit boards (PCBs). It is formed by impregnating reinforcing materials with resin, stacking the resulting prepregs after high-temperature baking, and covering one or both sides with copper foil through hot pressing. Copper clad laminates are widely used in the manufacture of electronic products, especially playing a crucial role in the production of multi-layer circuit boards. The peel strength of a copper clad laminate refers to the force at which the copper-clad layer peels off from the substrate under certain conditions. The level of peel strength is directly related to the connection reliability and stability of the circuit board. Insufficient peel strength can lead to poor circuit connections and even cause the circuit board to fail. Therefore, the peel strength testing of copper clad laminates is of great significance for ensuring the quality of circuit boards.

[0003] Existing methods for testing the peel strength of copper clad laminates are mainly achieved through tensile tests. The specific steps are as follows:

[0004] Prepare specimens: Cut specimens with a predetermined width on the copper clad laminate to be tested. This step usually requires manual operation, using a knife or a laser cutting device for cutting.

[0005] Pre-treat specimens: In order to fix the specimens on the test fixture, a part of the copper foil needs to be pre-peeled for clamping. The process of peeling the copper foil also requires manual operation, and the peeled length needs to be appropriate to ensure the accuracy of the peel test.

[0006] Install specimens: Clamp the peeled part of the copper foil on the peel fixture, and at the same time, paste the substrate part of the specimen on the rotating drum of the peel fixture through double-sided tape. This step also relies on manual operation to ensure the stable installation of the specimen.

[0007] Conduct the test: Start the peel testing machine, peel the copper foil at a certain rate, and record the force and displacement data during the peeling process to calculate the peel strength.

[0008] Although the existing methods for testing the peel strength of copper clad laminates can evaluate the peel performance of copper clad laminates to a certain extent, there are still many deficiencies:

[0009] From cutting the specimens to pre-treating and installing the specimens, the whole process requires a large amount of manual work. This not only increases the labor intensity of the testers but also may lead to operation errors, affecting the accuracy of the test results. Manual operation is not only time-consuming but also difficult to control the cutting depth, thus affecting the precision of the specimens. Inconsistent depths may cause uneven peel forces during the test, thereby affecting the reliability of the test results.

[0010] During the stripping process, it is difficult to ensure the perpendicularity between the copper foil and the substrate. If the copper foil after stripping is not perpendicular to the substrate, the stripping force will be affected, resulting in a decrease in test accuracy.

[0011] Therefore, it is necessary to provide a stripping strength test device for a copper clad laminate to solve the problems raised in the above-mentioned background technology. Summary of the Invention

[0012] To achieve the above object, the present invention provides the following technical solution: A stripping strength test device for a copper clad laminate, comprising:

[0013] A base, on the left end of which a vertical guide rail is fixedly installed;

[0014] A clamping jaw, which is slidably arranged in the vertical guide rail;

[0015] A lifting mechanism, including a lifting screw rod rotatably arranged in the vertical guide rail and a driving motor connected to the upper end of the lifting screw rod, the lifting screw rod being threadedly connected to the clamping jaw;

[0016] A horizontal guide rail, which is slidably arranged on the base and located directly below the clamping jaw;

[0017] A pressure strip, arranged on both sides of the horizontal guide rail;

[0018] A grinding roller, arranged at the right end of the base;

[0019] Two cutting wheels, arranged on the base and corresponding to the upper part of the middle of the horizontal guide rail.

[0020] Furthermore, a tensile sensor is arranged in the clamping jaw for measuring the tensile force when stripping the copper foil.

[0021] Furthermore, both ends of the grinding roller are respectively connected to a grinding bracket, the grinding bracket is fixed on the base, an arc-shaped groove is formed in the grinding bracket, the grinding roller is rotatably and slidably connected to the arc-shaped groove, and a grinding motor is arranged at one end of the grinding roller.

[0022] Furthermore, each cutting wheel is rotatably connected to a connecting block, the two connecting blocks are slidably connected to the same rotating shaft, the rotating shaft is slidably and rotationally restrictedly connected to the cutting wheel, one end of the rotating shaft is connected to a cutting motor, and both ends of the rotating shaft are respectively connected to a cutting bracket.

[0023] Furthermore, a cutting slider is slidably arranged on each cutting bracket, a height knob for adjusting the cutting slider is arranged in the cutting bracket, and the rotating shaft is rotatably connected to the cutting slider.

[0024] Further, a lead screw is rotatably arranged between the two cutting sliders. The thread directions on both sides of the lead screw with the center as the boundary are opposite. The two cutting sliders are respectively threadedly connected to the threads at both ends of the lead screw. A distance knob is arranged at one end of the lead screw.

[0025] Further, a linkage rod is hinged above each cutting bracket. The other end of the linkage rod is hinged to a sliding shaft. The sliding shaft is slidably connected in the arc-shaped groove and rotatably connected to the grinding roller. A chute is formed in the linkage rod, and the chute is slidably connected to the cutting slider on the corresponding side.

[0026] Further, a driven shaft perpendicular to the lifting screw is rotatably arranged at the lower end of the lifting screw, and a gear is fixed in the driven shaft;

[0027] A rack is fixed at the bottom of the horizontal guide rail, and the rack meshes with the gear.

[0028] Further, a top block is rotatably arranged in the middle of the right end of the horizontal guide rail. A torsion spring is arranged between the top block and the horizontal guide rail. The torsion spring makes the top block tilt downward in the natural state.

[0029] Further, a guide rod is fixed below the top block, and a baffle is fixed on the left end of the base. The baffle is at the same height as the guide rod.

[0030] Compared with the prior art, the beneficial effects of the present invention are:

[0031] In the present invention, multiple steps such as grinding, cutting, clamping, and peeling are integrated. Through motor drive and mechanical linkage, a high degree of automation of the test process is achieved. The operator only needs to perform simple parameter setting and start-up operations to complete the entire test process, greatly reducing the operation difficulty and time cost.

[0032] By adjusting parameters such as the height and spacing of the grinding roller and the cutting wheel, the present invention can adapt to the test requirements of copper clad laminates with different thicknesses and specifications. Ensure that the grinding roller only removes part of the substrate without damaging the copper foil, and the cutting wheel only cuts the copper foil without cutting the substrate.

[0033] The meshing design of the gear and the rack in the present invention ensures that during the peeling test of the clamping jaw, the copper foil and the substrate always remain perpendicular, avoiding the influence of copper foil bending on the test results. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of a peeling strength test device for a copper clad laminate;

[0035] Figure 2 It is a three-dimensional structural diagram of the position of the horizontal guide rail in the present invention;

[0036] Figure 3 Schematic side view of the horizontal guide rail in the present invention;

[0037] Figure 4 Schematic internal view of the horizontal guide rail in the present invention;

[0038] Figure 5 Schematic view of the structure when the horizontal guide rail slides to the left in the present invention;

[0039] Figure 6 Schematic view of the structure when the horizontal guide rail slides to the right in the present invention;

[0040] In the figure: 1. Base; 2. Vertical guide rail; 21. Lifting screw; 22. Driving motor; 23. Driven shaft; 24. Gear; 3. Claw; 4. Horizontal guide rail; 41. Rack; 5. Pressure strip; 6. Grinding roller; 61. Grinding bracket; 62. Arc groove; 63. Sliding shaft; 64. Grinding motor; 7. Cutting wheel; 71. Connecting block; 72. Cutting slider; 73. Cutting bracket; 74. Height knob; 75. Rotating shaft; 76. Cutting motor; 77. Lead screw; 78. Distance knob; 8. Top block; 81. Guide rod; 82. Baffle; 9. Linking rod; 91. Chute. Detailed implementation manners

[0041] Please refer to Figures 1-6 , in an embodiment of the present invention, a peel strength testing device for a copper clad laminate includes:

[0042] Base 1, on the left end of which a vertical guide rail 2 is fixedly installed;

[0043] Claw 3, which is slidably arranged in the vertical guide rail 2 and is used for clamping the copper foil part to be tested;

[0044] Lifting mechanism, including a lifting screw 21 rotatably arranged in the vertical guide rail 2 and a driving motor 22 connected to the upper end of the lifting screw 21, the lifting screw 21 is threadedly connected to the claw 3 and is used for driving the claw 3 to move up and down along the vertical guide rail 2;

[0045] Horizontal guide rail 4, which is slidably arranged on the base 1 and is located directly below the claw 3 and is used for supporting the copper clad laminate;

[0046] Pressure strip 5, which is arranged on both sides of the horizontal guide rail 4 and is used for pressing both sides of the copper clad laminate placed on the horizontal guide rail 4;

[0047] Grinding roller 6, which is arranged at the right end of the base 1 and is used for grinding off the substrate part of the copper clad laminate extending outside the right end of the horizontal guide rail 4 while retaining the copper foil;

[0048] Two cutting wheels 7 are arranged on the base 1 and above the middle of the horizontal guide rail 4, and are used to cut copper foils with a predetermined width on the surface of the copper clad laminate.

[0049] In this embodiment, a tensile sensor is arranged in the jaw 3 and is used to measure the tensile force when stripping the copper foil.

[0050] Wherein, the distance between the cutting wheel 7 and the grinding roller 6 is greater than the length of a copper clad laminate. When the copper clad laminate is placed on the horizontal guide rail 4 and one side thereof extends out of the right end of the horizontal guide rail 4, after being pressed by the pressing strip 5, the grinding roller 6 grinds off the substrate part extending from the copper clad laminate from the bottom. Subsequently, the horizontal guide rail 4 slides to the left, so that the two cutting wheels 7 cut copper foils with a predetermined width on the copper clad laminate until the right end of the horizontal guide rail 4 moves to directly below the jaw 3. At this time, the jaw 3 clamps the cut copper foil under the drive of the lifting mechanism and slides upward, realizing the stripping of the copper foil from the substrate. At the same time, the tensile sensor measures and records the tensile force during the stripping process.

[0051] Please refer to Figure 2 and Figure 3 In this embodiment, both ends of the grinding roller 6 are respectively connected to a grinding bracket 61. The grinding bracket 61 is fixed on the base 1. An arc-shaped groove 62 is formed in the grinding bracket 61. The grinding roller 6 is rotatably and slidably connected to the arc-shaped groove 62. A grinding motor 64 is arranged at one end of the grinding roller 6.

[0052] By changing the position of the grinding roller 6 in the arc-shaped groove 62, the height of the grinding roller 6 can be adjusted, so as to adapt to grinding copper clad laminate substrates with different thicknesses.

[0053] In this embodiment, each cutting wheel 7 is rotatably connected to a connecting block 71. The two connecting blocks 71 are slidably connected to the same rotating shaft 75. The rotating shaft 75 is slidably and rotationally restrictedly connected to the cutting wheel 7. One end of the rotating shaft 75 is connected with a cutting motor 76. Both ends of the rotating shaft 75 are respectively connected to a cutting bracket 73.

[0054] By sliding the connecting block 71, the distance between the two cutting wheels 7 can be changed, so as to adjust the width of the copper foil cut on the copper clad laminate. By means of the cutting motor 76, the two cutting wheels 7 can be driven to rotate synchronously.

[0055] In this embodiment, a cutting slider 72 is slidably arranged on each cutting bracket 73. A height knob 74 capable of adjusting the cutting slider 72 is arranged in the cutting bracket 73. The rotating shaft 75 is rotatably connected to the cutting slider 72.

[0056] The height of the cutting wheel 7 can be adjusted by rotating the height knob 74, so as to adapt to copper clad laminates of different thicknesses, ensuring that the cutting wheel 7 only cuts the copper foil on the surface of the copper clad laminate without cutting the substrate.

[0057] In this embodiment, a lead screw 77 is rotatably arranged between the two cutting sliders 72. The thread directions on both sides of the lead screw 77 with the center as the boundary are opposite. The two cutting sliders 72 are respectively threadedly connected to the threads at both ends of the lead screw 77, and a distance knob 78 is arranged at one end of the lead screw 77.

[0058] By rotating the distance knob 78 to rotate the lead screw 77, the distance between the two cutting sliders 72 can be adjusted, and it can be ensured that the copper foils cut by the two cutting wheels 7 are centered on the cross rail 4.

[0059] In this embodiment, a linkage rod 9 is hinged above each cutting bracket 73. The other end of the linkage rod 9 is hinged to a sliding shaft 63. The sliding shaft 63 is slidably connected in the arc-shaped groove 62 and rotatably connected to the grinding roller 6. A chute 91 is formed in the linkage rod 9, and the chute 91 is slidably connected to the corresponding cutting slider 72 on one side.

[0060] That is to say, when the height of the cutting slider 72 changes, it will drive the linkage rod 9 to rotate, so that the height of the grinding roller 6 also changes accordingly, enabling copper clad laminates of different thicknesses to be ground off the substrate on one side by the grinding roller 6 and enabling the copper foil to be cut by the cutting wheel 7 without cutting the substrate.

[0061] Please refer to Figure 4 , in this embodiment, a driven shaft 23 perpendicular to it is rotatably arranged at the lower end of the lifting screw 21, and a gear 24 is fixed in the driven shaft 23;

[0062] A rack 41 is fixed at the bottom of the cross rail 4, and the rack 41 meshes with the gear 24.

[0063] When the lifting screw 21 rotates to lower the clamping jaw 3, it will drive the cross rail 4 to slide to the left through the gear 24 and the rack 41. Vice versa, and the sliding speed of the clamping jaw 3 is the same as the sliding speed of the cross rail 4, so that when the clamping jaw 3 clamps the copper foil for peeling test, the copper foil and the substrate always remain perpendicular, avoiding the copper foil being bent at different angles and affecting the test results.

[0064] In this embodiment, a top block 8 is rotatably arranged in the middle of the right end of the cross rail 4. A torsion spring is arranged between the top block 8 and the cross rail 4, and the torsion spring makes the top block 8 tilt downward in the natural state.

[0065] In this embodiment, a guide rod 81 is fixed below the top block 8, and a baffle 82 is fixed on the left end of the base 1. The baffle 82 is at the same height as the guide rod 81.

[0066] That is to say, when the horizontal guide rail 4 is located at the right end of the base 1, under the action of the torsion spring, the top block 8 is in a downward inclined state to avoid obstructing the grinding roller 6. When the horizontal guide rail 4 slides to the left end of the base 1, the guide rod 81 will hit the baffle 82, so that the top block 8 rotates upward against the elastic force of the torsion spring, causing the copper foil of the part with the substrate ground off by the grinding roller 6 and cut into a predetermined width by the cutting wheel 7 on the copper clad laminate to be lifted by the top block 8, enabling the clamping jaw 3 to clamp this part of the copper foil for subsequent peeling test.

[0067] During specific implementation: adjust the distance knob 78 to set the distance between the two cutting wheels 7 to ensure that a copper foil with a predetermined width can be cut on the copper clad laminate;

[0068] According to the thickness of the copper clad laminate to be measured, adjust the height knob 74 to set the height of the cutting wheel 7 to ensure that the cutting wheel 7 only cuts the copper foil on the surface of the copper clad laminate without cutting the substrate. At the same time, under the action of the linkage rod 9, the grinding roller 6 is also adjusted synchronously to ensure that the substrate can be removed without damaging the copper foil during grinding;

[0069] In the initial state, the horizontal guide rail 4 is at the right end of the base 1. Place the copper clad laminate to be measured flat on the horizontal guide rail 4, ensuring that one end extends out of the right end of the horizontal guide rail 4. Press both sides of the copper clad laminate tightly through the pressure strip 5 to prevent it from moving during grinding and cutting;

[0070] Start the grinding motor 64 to make the grinding roller 6 rotate and start grinding the substrate part of the copper clad laminate that extends out of the right end of the horizontal guide rail 4; after grinding is completed, turn off the grinding motor 64;

[0071] Start the cutting motor 76 to make the two cutting wheels 7 rotate synchronously. Start the driving motor 22 to make the lifting screw 21 rotate. At this time, the horizontal guide rail 4 slides to the left, and the cutting wheel 7 cuts a copper foil with a predetermined width on the copper clad laminate. After cutting is completed, turn off the cutting motor 76;

[0072] When the horizontal guide rail 4 slides to the left end of the base 1, the guide rod 81 hits the baffle 82, causing the top block 8 to rotate upward against the elastic force of the torsion spring to complete the action of lifting the copper foil;

[0073] After the horizontal guide rail 4 slides to the left end of the base 1, the clamping jaw 3 descends and clamps the cut and lifted copper foil part;

[0074] The driving motor 22 rotates in the reverse direction. At this time, the clamping jaw 3 rises, and at the same time, the horizontal guide rail 4 slides to the right to realize the peeling of the copper foil with a predetermined width from the substrate. During the peeling process, the tensile force sensor measures and records the peeling tensile force in real time;

[0075] After peeling is completed, read the peeling tensile force data from the tensile force sensor, and evaluate the peeling strength performance of the copper clad laminate by analyzing the data.

[0076] The above are only the preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. A peel strength testing device for a copper clad laminate, characterized in that: include: A base (1), wherein a vertical guide rail (2) is fixedly mounted on the left end of the base (1); A clamping claw (3), the clamping claw (3) being slidably disposed in the vertical guide rail (2); A lifting mechanism, comprising a lifting screw (21) rotatably arranged in the vertical guide rail (2) and a driving motor (22) connected to the upper end of the lifting screw (21), wherein the lifting screw (21) is threadedly connected to the clamping claw (3); A transverse guide rail (4), the transverse guide rail (4) being slidably disposed on the base (1) and being located directly below the clamping claw (3); Pressure strips (5) are arranged on both sides of the transverse guide rail (4); A grinding roller (6) is arranged at the right end of the base (1); Two cutting wheels (7) are arranged on the base (1) and correspond to the upper part of the middle part of the transverse guide rail (4); The grinding roller (6) grinds off the base plate portion extending from the copper-clad laminate from the bottom, and then the transverse guide rail (4) slides to the left, so that the two cutting wheels (7) cut copper foil of a predetermined width on the copper-clad laminate.

2. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: The clamping jaw (3) is provided with a tension sensor for measuring the tension when peeling off the copper foil.

3. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: Both ends of the grinding roller (6) are connected to a grinding bracket (61), the grinding bracket (61) is fixed on the base (1), an arc groove (62) is provided in the grinding bracket (61), the grinding roller (6) is rotatably and slidably connected to the arc groove (62), and a grinding motor (64) is provided at one end of the grinding roller (6).

4. The peel strength testing device for a copper clad laminate according to claim 3, characterized in that: Each of the cutting wheels (7) is rotatably connected to a connecting block (71), and the two connecting blocks (71) are slidably connected to the same rotating shaft (75). The rotating shaft (75) is slidably connected to the cutting wheel (7) and is rotationally restricted. One end of the rotating shaft (75) is connected to a cutting motor (76), and both ends of the rotating shaft (75) are respectively connected to a cutting bracket (73).

5. The peel strength testing device for a copper clad laminate according to claim 4, characterized in that: A cutting slider (72) is slidably disposed on each cutting bracket (73), a knob (74) capable of adjusting the height of the cutting slider (72) is disposed in the cutting bracket (73), and the rotating shaft (75) is rotatably connected to the cutting slider (72).

6. The peel strength testing device for a copper clad laminate according to claim 5, characterized in that: A screw rod (77) is rotatably arranged between the two cutting sliders (72), and the threads of the screw rod (77) on both sides of the center are rotated in opposite directions. The two cutting sliders (72) are respectively threadedly connected to the threads at both ends of the screw rod (77), and a distance knob (78) is arranged at one end of the screw rod (77).

7. The peel strength testing device for a copper clad laminate according to claim 6, characterized in that: A connecting rod (9) is hinged on the top of each cutting bracket (73), and the other end of the connecting rod (9) is hinged to a sliding shaft (63). The sliding shaft (63) is slidably connected in the arc groove (62) and rotatably connected to the grinding roller (6). A sliding groove (91) is provided in the connecting rod (9), and the sliding groove (91) is slidably connected to the cutting slider (72) on the corresponding side.

8. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: A driven shaft (23) is rotatably disposed at the lower end of the lifting screw (21) and is perpendicular thereto, and a gear (24) is fixed in the driven shaft (23); A rack (41) is fixed to the bottom of the transverse guide rail (4), and the rack (41) is meshed with the gear (24).

9. The peel strength testing device for a copper clad laminate according to claim 1, characterized in that: A top block (8) is rotatably arranged at the middle of the right end of the transverse guide rail (4), and a torsion spring is arranged between the top block (8) and the transverse guide rail (4), wherein the torsion spring causes the top block (8) to tilt downward in a natural state.

10. The peel strength testing device for copper clad laminate according to claim 9, characterized in that: A guide rod (81) is fixed below the top block (8), and a baffle (82) is fixed on the left end of the base (1), wherein the baffle (82) is at the height of the guide rod (81).

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